There are 12 US Post Offices in Woodford County serving a total of 35,788 residents equating to 2,982 residents per post office. It's estimated that approximately 57,122 packages are handled across the 12 county post offices annually. Woodford County is a county located in the state of Illinois. According to the 2010 census, it had a population of 38,664. Its county seat is Eureka. Woodford County is part of the Peoria, IL, Metropolitan Statistical Area. Its name comes from General William Woodford, an officer of the American Revolutionary War who served at the brutal military encampment at Valley Forge, Pennsylvania."